Is there a way to make a copy in memory of a persistent model ?
the goal is to make a compare.
I try to use backingData but when i update the main model the backingData is also updated.
Is this a bug or am not using the method properly ?
Best.
let model = Model()
let modelBackingData = Model(backingData: model.backingData)
mandriao84
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Post
Replies
Boosts
Views
Activity
When you set your container "manually", how can we interact with the isAutosaveEnabled and isUndoEnabled parameters from the modelContainer ?
let schema:Schema = Schema([
Model.self
])
let configuration:ModelConfiguration = ModelConfiguration()
let container:ModelContainer = try ModelContainer(for:schema, configuration)
let context:ModelContext = ModelContext(container)
When navigating with the screen, the tab selection should be updated accordingly but it does not.
I try with the observable protocol or with the state property wrapper, same results...
import SwiftUI
import SwiftData
struct MainView: View {
@Environment(\.modelContext) private var db
@Environment(NavigationObservable.self) private var navigationObservable
// @State private var tab:String = "tab1"
var body: some View {
TabView(
selection:Binding(
get: { navigationObservable.tab },
set: { newValue in navigationObservable.tab = newValue }
)
) {
// TabView(
// selection:$tab
// ) {
Text("tab1")
.tag("tab1")
Text("tab2")
.tag("tab2")
}
.tabViewStyle(.page(indexDisplayMode:.never))
.onChange(of: navigationObservable.tab) {
print(navigationObservable.tab)
}
// .onChange(of: tab) {
// print(tab)
// }
}
}
I can't find a way to make this relationship, Anyone to tell me what am i doing wrong please ?
import SwiftUI
import SwiftData
@Model class Model1 {
@Attribute(.unique) var id:String
var date:Date
@Relationship(.cascade) var model2:[Model2]
init() {
self.id = UUID().uuidString
self.date = Date()
self.model2 = []
}
}
@Model class Model2 {
@Attribute(.unique) var id:String
var date:Date
@Relationship(inverse: \Model1.model2) var model1:Model1
init(
model1:Model1
) {
self.id = UUID().uuidString
self.date = Date()
self.model1 = model1
}
}
struct view1:View {
@Environment(\.modelContext) private var db
var body: some View {
Text("TapMe")
.onTapGesture {
let m1 = Model1()
db.insert(m1)
let m2 = Model2(model1: m1)
db.insert(m2)
}
}
}
Error :
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Illegal attempt to establish a relationship 'm1' between objects in different contexts (source = <NSManagedObject: 0x280b253b0> (entity: Model2; id: 0x282896ca0 <x-coredata:///Model2/tCB971C15-AFE3-46A2-A1FB-E688E0EF2ABF207>; data: {
date = "2023-07-10 20:22:56 +0000";
id = "625B994D-24BB-4935-A438-8AA6522C0FE1";
m1 = nil;
}) , destination = <NSManagedObject: 0x280b250e0> (entity: Model1; id: 0x2828eaa40 <x-coredata:///Model1/tCB971C15-AFE3-46A2-A1FB-E688E0EF2ABF206>; data: {
date = "2023-07-10 20:22:56 +0000";
id = "BA3E6CF3-67EC-41CA-A150-E66E0D7226B2";
m2 = (
);
}))'
Hello,
We no longer can update manually the focusState.
@FocusState var focused:Bool
var body: some View {
Text("tapMe")
.onTapGesture { focused = true; print(focused) /** focused = false */ }
}
Best.
@Model class AModel {
@Attribute(.unique) var id:String
var date:Date
var b:[BModel]
init() {
self.id = UUID().uuidString
self.date = Date()
self.b = []
}
}
@Model class BModel {
@Attribute(.unique) var id:String
var date:Date
init() {
self.id = UUID().uuidString
self.date = Date()
}
}
struct MainView: View {
@Environment(\.modelContext) private var db
@State private var a:AModel = AModel()
var body: some View {
VStack {
}
.onAppear {
a.b.append(BModel())
print(a.b)
}
}
}
// CRASH :
@Model class AModel {
@Attribute(.unique) var id:String
var date:Date
var b:[BModel]
/**
Thread 1: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)
{
get {
_$observationRegistrar.access(self, keyPath: \.b)
return self.getValue(for: \.b)
}
set {
_$observationRegistrar.withMutation(of: self, keyPath: \.b) {
self.setValue(for: \.b, to: newValue)
}
}
}
*/
init() {
self.id = UUID().uuidString
self.date = Date()
self.b = []
}
}
@Model class BModel {
@Attribute(.unique) var id:String
var date:Date
init() {
self.id = UUID().uuidString
self.date = Date()
}
}
Hello,
Since iOS16, I noticed a glitch when switching from tabN to tabN+1 or tabN-1 and reverse with complex embedded view.
Also the animation to switch tab programmatically are no longer working when I use an observableObject as a selection :
@EnvironmentObject var ViewModel: VM
TabView(selection: $ViewModel.tabRouter) {
View1()
.tag("first")
View2()
.tag("second")
View3()
.tag("third")
}
.animation(.default, value: ViewModel.tabRouter)
.tabViewStyle(.page(indexDisplayMode: .never))
.ignoresSafeArea(edges: .bottom)
On iOS15 everything works smoothly.
Best